SGA对重金属污染矿区土壤中重金属的稳定化性能研究  

Solidification Performance for Heavy Metals in Polluted Soils of Mined Area Using Sixthio Guanidine Acid(SGA)

作　　者：张帆[1,2] 王风贺[1] 郝昊天 邹丽娜[1] 纪营雪[1,2] 段伦超[1] 顾中铸[2] 

机构地区：[1]江苏省物质循环与污染控制重点实验室,南京师范大学环境科学与工程系,江苏南京210023 [2]南京师范大学能源与机械工程学院,江苏南京210042

出　　处：《南京师大学报（自然科学版）》2014年第3期62-66,72,共6页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(41101287);江苏省科技支撑计划项目(BE2012758);江苏高校优势学科建设工程资助项目

摘　　要：对铅锌矿区周边土壤中Pb、Cd、As等重金属分别进行了总量及其形态研究.重点考察重金属固化剂六硫代胍基甲酸(SGA)和二甲基二硫代氨基甲酸盐(SDD)对不同形态重金属的稳定化性能.研究结果表明,采集的土壤样品受Pb、Cd、As等重金属污染较为严重,样品S1中As、Pb含量分别超过土壤环境质量三级标准10.17倍、3.29倍,Cd超过土壤环境质量二级标准28.7倍.SGA对弱酸态As、Cd和Pb的综合稳定化性能优良,对3种重金属的稳定化率最高达到92.73%、82.35%和81.48%;SDD对可氧化态Cd稳定化性能优于SGA,最高稳定化率为88.89%.SGA作为一种新型重金属螯合捕集剂,可以应用于重污染土壤中重金属的污染控制和修复.The characteristics and distribution of different forms of heavy metals in soils contaminated from mined area were investigated,and were evaluated according to the BCR sequential extraction protocol. Stabilization performance of sixthio guanidine acid（ SGA） and sodium dimethyl dithio darbamate（ SDD） were compared. The results indicated that the soils were contaminated seriously by lead,cadmium and arsenium,the contents of As and Pb exceeded 10. 17 times and3. 29 times than that of Environmental Quality Standard for Soils（ GB 15618-1995） with the Grade Ⅲ standard respectively,and the content of Cd exceeded 28. 7 times. SGA had an excellent comprehensive property in stabilization of the heavy metals of acid soluble in soils,the stabilization ratios for As,Pb and Cd were 92. 73%,82. 35% and 81. 48%respectively,while SDD had a better property in immobilization of the heavy metals of oxidizable compared with SGA. As a novel heavy metal chelating agent,SGA can be used in remediation of soils contaminated by heavy metals.

关 键 词：重金属捕集剂 土壤 重金属 稳定化 

分 类 号：X53[环境科学与工程—环境工程]